The diffusion of carbon was measured using radioactive tracers and sectioning

techniques. The diffusion in stoichiometric material as a function of temperature was described by:

D(cm2/s) = 1.75 exp[-63000/RT]

at 1266 to 1684C.

H.M.Lee, L.R.Barbett: Journal of Nuclear Materials, 1968, 27[3], 275-84